package normalclass;

public class Demo01 {
    public static void main(String[] args) {
        Worker worker = new Worker();
        worker.name = "老王";
        method01(worker);//老王
        method02(new Worker());//null

    }

    public static void method01(Worker w) {
        System.out.println(w.name);
    }
    public static void method02(Person p) {
        System.out.println(p.name);
    }
}
